SharpBoot is an easy to use utility for creating multiboot ISO files or bootable USB keys. It's another free and open-source alternative to Xboot and it's simple: you just need to drag-n-drop ISO/IMG files and click on a button, and you can directly try it on QEMU that is integrated.You can choose between Syslinux and Grub4DOS, Fat12, Fat16, Fat32 or NTFS, 640x480, 800x600, 1024x768 or 1280x1024 and even the background image (ImageMagick is integrated so that images can be made compatible with Grub4DOS) !